US Patent: 1,212,194


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Plumb-Bob

Patentee:

Archer F. Duguid (exact or similar names) - Montreal, QC Canada

USPTO Classifications:

Tool Categories:

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Patent Pictures:

Description:

This plumb bob has a series of cutouts in it to allow light to shine through it. This supposedly makes it easier for surveyors to sight on the bob.